CN115533110B - Preparation method of copper-zinc alloy powder - Google Patents
Preparation method of copper-zinc alloy powder Download PDFInfo
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- CN115533110B CN115533110B CN202211547880.5A CN202211547880A CN115533110B CN 115533110 B CN115533110 B CN 115533110B CN 202211547880 A CN202211547880 A CN 202211547880A CN 115533110 B CN115533110 B CN 115533110B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/088—Fluid nozzles, e.g. angle, distance
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- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention relates to a preparation method of copper-zinc alloy powder, which comprises the following specific steps: s1, preparing materials; s2, smelting; s3, atomizing water; s4, performing centrifugal dehydration; s5, reducing; s6, screening: screening the reduced metal alloy powder to obtain the copper-zinc alloy powder with the bulk ratio of 3.0-3.7g/cm for carrying out the high speed thin film processing. The invention adopts the reducing furnace for drying, the moisture can be completely dried, the temperature is well controlled, no caking is caused, the crushing is not needed, and the efficiency is high.
Description
Technical Field
The invention relates to the technical field of metal alloy powder preparation, in particular to a preparation method of copper-zinc alloy powder.
Background
Powder metallurgy is a new manufacturing method, has many advantages compared with the traditional casting and turning machining mode, has a series of characteristics of obvious energy saving, material saving, excellent performance, high product precision, good stability and the like, and is very suitable for mass production. The materials used in powder metallurgy are various, and are relatively common metal or nonmetal powder materials such as iron-based, copper-based and hard alloy materials, wherein brass powder of copper-zinc alloy has excellent wear resistance and corrosion resistance, and is widely applied to the fields of traffic, machinery, aerospace, ships, weapons, nuclear industry and the like.
The traditional copper-zinc alloy brass powder is obtained by atomizing copper-zinc alloy melt with water, the brass powder prepared by the method has large loss of raw materials in the smelting process, and meanwhile, a crushing process is required after a reduction process, and then the alloy powder is sieved, so that the production efficiency is low, and the development of enterprises is influenced.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a preparation method of copper-zinc alloy powder, which has the advantages of simple process, low raw material smelting loss, no need of crushing process for production and high production efficiency.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a preparation method of copper-zinc alloy powder comprises the following specific steps:
step S1, batching: adopting copper wires and 62 brass rods as raw materials, wherein the copper wires account for 35-50% of the total weight, and the 62 brass rods account for 50-65% of the total weight;
step S2, smelting: adding a copper wire and a 62 brass bar into an intermediate frequency furnace for smelting, and melting the raw materials into liquid through coil induction heating of the intermediate frequency furnace; when adding materials, firstly adding 62 brass rods, then adding copper wires, and finally adding charcoal on the surface to cover so as to prevent zinc from volatilizing; adding charcoal to cover, wherein the smelting loss is less than 0.3%;
step S3, water atomization: carrying out water atomization on the copper liquid obtained by smelting, and carrying out water atomization on the copper liquid to form an irregular particle-shaped object;
step S4, centrifugal dehydration: carrying out centrifugal dehydration on the water atomized irregular particle-shaped object to obtain dry metal alloy powder with the irregular particle shape;
step S5, reduction: reducing the dehydrated metal alloy powder by a reduction furnace, introducing ammonia decomposition gas for protective reduction in the reduction process, wherein the reduction temperature is 470-600 ℃, the reduction time is 2-3 hours, and the gas flow of the ammonia decomposition gas is 6-10m for carrying out the year/h;
s6, screening: screening the reduced metal alloy powder to obtain the copper-zinc alloy powder with the bulk ratio of 3.0-3.7g/cm for carrying out the high speed thin film processing.
Furthermore, in the water atomization process, the water pressure and the control of the spray ring and the nozzle are adopted, the nozzle is connected to the spray ring, and the spray ring is communicated with the water inlet pipe.
Further, a 100-mesh screen is used for screening in step S6.
Further, the water pressure is 13-18MPa.
Further, the nozzles comprise two types of nozzles with the water outlet diameters of 15mm and 10mm, wherein six nozzles with the water outlet diameters of 10mm are provided, two nozzles with the water outlet diameters of 15mm are provided, the two nozzles with the water outlet diameters of 15mm are symmetrically arranged on the central line, and the six nozzles with the water outlet diameters of 10mm are symmetrically arranged by taking the connecting line of the two nozzles with the water outlet diameters of 15mm as the axis; 8 nozzles are arranged on the spray ring in an annular array mode.
Furthermore, the water outlet of the nozzle forms an included angle of 32 degrees with the horizontal plane.
(III) advantageous effects
The invention has the beneficial effects that: 1. when adding materials, firstly adding 62 brass rods, then adding copper wires, and finally adding charcoal on the surface to cover so as to prevent zinc from volatilizing; the feeding sequence influences the loss of raw materials; especially the loss of zinc content, the charcoal is added for covering, and the smelting loss is less than 0.3 percent.
2. And the reduction furnace is adopted for drying, so that the moisture can be completely dried, the temperature is well controlled, no caking is caused, the crushing is not needed, and the efficiency is high.
3. In the water atomization process, the water pressure and the control of a spray ring and nozzles are adopted, the nozzles are connected to the spray ring, the water pressure is 13-18MPa, the nozzles comprise two nozzles with the water outlet diameters of 15mm and 10mm, six nozzles with the water outlet diameters of 10mm are arranged, and two nozzles with the water outlet diameters of 15mm are arranged; the copper-zinc alloy powder has the following bulk ratio: 3.0-3.7 g/cm.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof.
The preparation method of the copper-zinc alloy powder provided by the embodiment of the invention comprises the following specific steps:
step S1, batching: adopting copper wires and 62 brass rods as raw materials, wherein the copper wires account for 35-50% of the total weight, and the 62 brass rods account for 50-65% of the total weight;
step S2, smelting: adding a copper wire and a 62 brass bar into an intermediate frequency furnace for smelting, and melting the raw materials into liquid through coil induction heating of the intermediate frequency furnace; when adding materials, firstly adding 62 brass rods, then adding copper wires, and finally adding charcoal on the surface to cover so as to prevent zinc from volatilizing;
the feeding sequence influences the loss of raw materials; especially, the loss of zinc content is covered by adding charcoal, and the smelting loss is lower than 0.3 percent;
step S3, water atomization: carrying out water atomization on the copper liquid obtained by smelting, and carrying out water atomization on the copper liquid to form an irregular particle-shaped object;
step S4, centrifugal dehydration: carrying out centrifugal dehydration on the water atomized irregular particle-shaped object to obtain dry metal alloy powder with the irregular particle shape;
step S5, reduction: reducing the dehydrated metal alloy powder by a reduction furnace, introducing ammonia decomposition gas for protection reduction in the reduction process, wherein the reduction temperature is 470-600 ℃, the reduction time is 2-3 hours, and the gas flow of the ammonia decomposition gas is 6-10m for transportation/h; the reduction furnace is adopted for drying, the color is good, the moisture can be completely dried, the temperature is well controlled, no caking is caused, the crushing is not needed, and the efficiency is high;
s6, screening: and screening the reduced metal alloy powder to obtain copper-zinc alloy powder, wherein a 100-mesh screen is adopted during screening.
In this embodiment, the copper-zinc alloy powder is mixed and/or packaged according to the production requirements.
In this example, the metal alloy powder does not agglomerate at the reduction temperature of 470 to 600 ℃, and thus the crushing process is not required.
In the embodiment, in the water atomization process, the water pressure, the spray ring and the nozzles are controlled, the nozzles are connected to the spray ring, the spray ring is communicated with the water inlet pipe, the water pressure is 13-18MPa, the nozzles comprise two nozzles with the water outlet diameters of 15mm and 10mm, six nozzles with the water outlet diameters of 10mm are provided, two nozzles with the water outlet diameters of 15mm are symmetrically arranged on the center line, and the six nozzles with the water outlet diameters of 10mm are symmetrically arranged by taking the connecting line of the two nozzles with the water outlet diameters of 15mm as the axis; 8 nozzles are arranged on the spray ring in an annular array mode; furthermore, an included angle of 32 degrees is formed between the water outlet of the nozzle and the horizontal plane; the bulk ratio of the copper-zinc alloy powder is as follows: 3.0-3.7 g/cm.
The following performance parameters are based on 43% of the total weight of the copper wire and 57% of the total weight of the 62 brass rod;
product performance of the Cu-Zn alloy powder of this example
1. Physical Properties
(1) The pine ratio: 3.0-3.7g/cm high yield
The water pressure is 15MPa and the nozzles comprise water outlets with the diameters of 15mm and 10mm under the control of the water pressure, the spray ring and the nozzles, wherein six nozzles with the diameters of 10mm are arranged, and two nozzles with the diameters of 15mm are arranged;
as can be seen from the above table, the bulk ratio is in the middle limit value when the hydraulic pressure is between 15MPa and 16MPa, the yield is high, and the formability is good. Generally, the higher the apparent density, the poorer the formability, the easy occurrence of edge drop and corner drop in the process of producing products, and the quality risk exists, and if the apparent density is too low, the coarse slag will be increased, so the yield is lower, and the hydraulic pressure is between 15MPa and 16 MPa.
(2) The requirement of particle size distribution:
from the above table, the particle size of the copper-zinc alloy powder is not limited, and the production of different particle sizes can be carried out according to market demands.
(3) Flow rate: 15-35s/50g
2. Chemical properties
Cu：78-82%
Zn：18-22%
3. Sintering property
(1) Sintering shrinkage and strength at different temperatures:
the above table shows sintering parameters of powders produced under a hydraulic pressure of 15MPa, which are adjusted to market requirements by sintering temperature, since shrinkage increases and strength increases simultaneously with temperature increase, and shrinkage rates required by the market are different.
Use of the copper-zinc alloy powder of the present example: 1. the powder metallurgy micro motor bearing is used; 2. powder metallurgy balance rings, structural members; 3. the surface spraying industry.
The above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (4)
1. The preparation method of the copper-zinc alloy powder is characterized by comprising the following specific steps of:
step S1, batching: adopting copper wires and 62 brass rods as raw materials, wherein the copper wires account for 35-50% of the total weight, and the 62 brass rods account for 50-65% of the total weight;
step S2, smelting: adding a copper wire and a 62 brass bar into an intermediate frequency furnace for smelting, and melting the raw materials into liquid through the intermediate frequency furnace; when adding materials, firstly adding 62 brass rods, then adding copper wires, and finally adding charcoal on the surface to cover so as to prevent zinc from volatilizing; adding charcoal to cover, wherein the smelting loss is less than 0.3%;
step S3, water atomization: carrying out water atomization on the copper liquid obtained by smelting, and carrying out water atomization on the copper liquid to form an irregular particle-shaped object;
step S4, centrifugal dehydration: carrying out centrifugal dehydration on the water atomized irregular particle-shaped object to obtain dry metal alloy powder with the irregular particle shape;
and S5, reduction: reducing the dehydrated metal alloy powder by a reduction furnace, introducing ammonia decomposition gas for protective reduction in the reduction process, wherein the reduction temperature is 470-600 ℃, the reduction time is 2-3 hours, and the gas flow of the ammonia decomposition gas is 6-10m for carrying out the year/h;
s6, screening: screening the reduced metal alloy powder to obtain Cu-Zn alloy powder with a bulk ratio of 3.0-3.7g/cm for carrying out heavy year;
in the water atomization procedure, the water pressure and the control of a spray ring and a nozzle are adopted, the nozzle is connected to the spray ring, and the spray ring is communicated with a water inlet pipe;
the nozzles comprise two types of nozzles with the water outlet diameters of 15mm and 10mm, wherein the number of the nozzles with the water outlet diameters of 10mm is six, the number of the nozzles with the water outlet diameters of 15mm is two, the two nozzles with the water outlet diameters of 15mm are symmetrically arranged in a central line manner, and the six nozzles with the water outlet diameters of 10mm are symmetrically arranged by taking a connecting line of the two nozzles with the water outlet diameters of 15mm as an axis; 8 nozzles are arranged on the spray ring in an annular array mode.
2. The method for preparing a copper-zinc alloy powder according to claim 1, wherein: and (5) adopting a 100-mesh screen during screening in the step S6.
3. The method for preparing a copper-zinc alloy powder according to claim 1, wherein: the water pressure is 13-18MPa.
4. The method for preparing a copper-zinc alloy powder according to claim 1, wherein: the water outlet of the nozzle forms an included angle of 32 degrees with the horizontal plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211547880.5A CN115533110B (en) | 2022-12-05 | 2022-12-05 | Preparation method of copper-zinc alloy powder |
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| CN202211547880.5A CN115533110B (en) | 2022-12-05 | 2022-12-05 | Preparation method of copper-zinc alloy powder |
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| CN115533110A CN115533110A (en) | 2022-12-30 |
| CN115533110B true CN115533110B (en) | 2023-03-10 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01205065A (en) * | 1988-02-09 | 1989-08-17 | Furukawa Electric Co Ltd:The | Manufacture of copper or copper-alloy bar having zn diffusion layer on surface |
| CN101837460A (en) * | 2010-04-26 | 2010-09-22 | 吴棕洋 | Method for preparing low-apparent-density copper powder through water atomization |
| RO127082A2 (en) * | 2010-02-17 | 2012-02-28 | Icpt Tehnomag Cug S.A. | Process for preparing copper powders by atomizing molten metal with high-pressure water and product prepared thereby |
| CN102962072A (en) * | 2012-11-30 | 2013-03-13 | 湖南省天心博力科技有限公司 | Sheet type copper-zinc alloy powder promoter |
| CN103589903A (en) * | 2013-08-16 | 2014-02-19 | 武汉泛洲中越合金有限公司 | High-strength and wear-resistant copper alloy and preparation method thereof |
| CN109706342A (en) * | 2018-12-29 | 2019-05-03 | 郑州机械研究所有限公司 | A kind of copper zinc silicon substrate powdery brazing filler metal material and preparation method thereof containing alterant |
| CN112996616A (en) * | 2018-11-20 | 2021-06-18 | 湖南特力新材料有限公司 | Method for preparing metal powder by water atomization method |
-
2022
- 2022-12-05 CN CN202211547880.5A patent/CN115533110B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01205065A (en) * | 1988-02-09 | 1989-08-17 | Furukawa Electric Co Ltd:The | Manufacture of copper or copper-alloy bar having zn diffusion layer on surface |
| RO127082A2 (en) * | 2010-02-17 | 2012-02-28 | Icpt Tehnomag Cug S.A. | Process for preparing copper powders by atomizing molten metal with high-pressure water and product prepared thereby |
| CN101837460A (en) * | 2010-04-26 | 2010-09-22 | 吴棕洋 | Method for preparing low-apparent-density copper powder through water atomization |
| CN102962072A (en) * | 2012-11-30 | 2013-03-13 | 湖南省天心博力科技有限公司 | Sheet type copper-zinc alloy powder promoter |
| CN103589903A (en) * | 2013-08-16 | 2014-02-19 | 武汉泛洲中越合金有限公司 | High-strength and wear-resistant copper alloy and preparation method thereof |
| CN112996616A (en) * | 2018-11-20 | 2021-06-18 | 湖南特力新材料有限公司 | Method for preparing metal powder by water atomization method |
| CN109706342A (en) * | 2018-12-29 | 2019-05-03 | 郑州机械研究所有限公司 | A kind of copper zinc silicon substrate powdery brazing filler metal material and preparation method thereof containing alterant |
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| CN115533110A (en) | 2022-12-30 |
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